File:Navy 3D sonar images reveals challenges of salvaging Baltimore's Francis Scott Key Bridge wreckage (240331-N-A1420-1007).jpg

English: This imagery, supplied by the U.S. Navy’s Naval Sea System Command (NAVSEA) Supervisor of Salvage and Diving (SUPSALV), shows the wreckage resting at the bottom of the river where the Francis Scott Key Bridge once stood. These 3D images show the sheer magnitude of the very difficult and challenging salvage operation ahead. The underwater sonar imaging tool, known as CODA Octopus, is the primary survey tool used by divers, with visibility clouded to just one to two feet because of the four to five feet of mud and loose bottom of the Patapsco River. Divers are forced to work in virtual darkness, because when lit, their view is similar to driving through a heavy snowfall at night with high-beam headlights on. So murky is the water, divers must be guided via detailed verbal directions from operators in vessels topside who are viewing real-time CODA imagery. No usable underwater video exists of the wreckage, because as one Navy diver stated, “there’s no need take video of something you can’t even see.”